Magneto.



PETER HAMM, 0F MILWAUKEE, WISCONSIN.

4 mcNnTo.

Specification of Letters Patent.

Patented June 1, 1915.

Application filed October 17,1913. Serial No; 795,616.

l magnetos and more particularly to that type in which the magnet alsoserves as the fly wheel of the engine of which it forms a part.

In detachable rowboat motors, and also in other motors for propellingvehicles of various kinds, it is very desirable to provide an ignitionsystem which is positive in its action, and in which the weight and sizeare reduced to the minimum.

It is one of the objects of the present invention to provide a magnetowhich possesses the before mentioned characteristics and is very simplein construction and is well adapted for the purpose desired.

A further object of the invention is to provide a magneto which may besubstituted for the fly-wheel of an engine and which will perform thefunction of a fly-wheel and at the same time supply current for theignition system of the engine.

A further object of the invention is to rovide a magneto having meansfor retardlng and advancing the sparking period to control the speed ofthe engine.

A further object of the invention is to provide a magneto in which thepermanent magnets thereof revolve around the armature of the magneto.

With the above and other objectsin view, the invention consists of theimproved magneto and its parts and combinations as set forth in theclaims and all equivalents thereof. r

In the accompanying drawing in which the same reference charactersindicate the same parts in all of the viewsi' Figure 1 is a sectionalview taken on line 11 of Fig. 2 of the improved magneto shown mounted onthe end of the cranked shaft of an internal explosionengine, only aportion of the shaft bein shown; Fi 2 is a sectional view thereo? -takenon line" 22 of Fig. 1, the figure also showing a diagram of theelectrical connections; Fig. 3 is a sectional view thereof taken on line3-3 of Fig. 1, the figure also showing a diagram of the electricalconnections; Fig. 4 is a sectional view thereof taken on line 44 of Fig.3; and, Fig. 5 is a sectional detail View taken on line 55 of Fig. 1.

Referring to the drawing the numeral 8 indicates an engine bearing, 9the cranked shaft and 10 the improved magneto mounted thereon.

The magneto comprises a casing 11 formed of a fixed armature plate 12upon which the stationary armature 13 is mounted, and a, flangedrevoluble fly-wheel member 14 which carries the permanent magnets 15.

The armature plate 12 is provided with a split hub portion 16 whichextends around the reduced end of the bearing 8 and is adjustablyclamped thereto by the bolt 17 which draws the split portions of the hubtogether. The said plate 12 is also provided with a radially projectinghandle 18 for convenience in turning the plate to advance or retard thetime of sparking. The handle carries a short circuit switch 19 mountedthereon and insulated therefrom which is adapted to short circuit andcontrol the stopping of the magneto.

The armature 13 is rigidly connected to the plate by screws 20 whichpass through the medial rectangular portion 21, and from this portionarmature cores 22 project from diametrically opposite sides thereof andterminate in' peripheral heads or pole pieces 23 which are concentricwith thelcranked shaft 9. i

The cores have primary and secondary coils of wire 24 and 25respectively, wound therearound and which extend from one core to theother.

One end 2.6 of the primary wire is connected to a lever 27 to form acontact breaker and also to onev of the terminals of a condenser 28mounted on the plate 12, and the opposite end 29 of the wire isconnected to the adjustable contact screw 30 and to the oppositeterminal of the condenser thus completing the primary circuit when themake and break lever is contacting with the contact screw.

The make and break lever is grounded on to form, .in connection with theplate 12, the

the plate 12 and a wire 31 extending from the wire 29 is connected tothe short circuit switch 19 to provide'for'short circuiting the primarycircuit to stop the engine when desired.

The annular flange 14' of the fiy wheel member projects at right anglestherefrom inclosing casing 11 within which is inclosed the armature andother parts just described and the permanent magnets 15. The permanentmagnets are semi-circular in form and are positioned within the casingand diametrically opposite each other and with ends of similar polarityadjacent to each other. The ends of adjacent magnets are connectedtogether by concentric pole shoes 32 which have their end portionsoffset from the magnets and their ends 33 slightly pointed to positivelyfix the points of break between the magnets and the pole pieces of thearmature.

The magnets are spaced and magnetically insulated from the annularflange 14 by brass washers 34 and 34, the latter of which also serves asa counterweight to counterlialance the cranked portion of the engineshaft.

The fiy-wheel member is provided with a projecting hub 35 which projectsloosely through the rectangular portion 21v of the armature and isprovided with a cam portion 36 on the periphery of itsinner end whichengages the contact breaker 27 once each revolution.

A strong magnetic field is formed between the pole shoes of thepermanent magnets so that as they'are revolved around the stationaryarmature,'a current is produced in the armature primary winding whichreaches its maximum power twice in each revolution, i, e., whenthe'pointed ends of the pole shoes revolve past the rear ends of thearmature pole pieces, therefore permitting two sparks to be produced ifdesired.

In the drawing, however, only one of the maximum periods is utilized asonly one cam is provided which is so positioned with relation to themaximum current as to break the primary circuit by engaging the contactbreaker once at each revolution at the time of one of the two maximumcurrent periods and thus by induction in thesecondary coil produce aspark at the plug 36. It is obvious that with the addition of anothercam that a spark may be produced at'each half revolution and whenconnected up to a distributer (not shown) of ordinary construction themagneto would be adapted to be used with a multiple cylinder enginewithout departing from the spirit and scope of the invention. Thesecondary coil 25 of the armature begins at its point of connection 37with the primary: circuit wire 24,- and from this point the secondarycoil extends around the armature cores on opposite sides of therectangular portion 21 and passes out of the back of the casing throughan insulated opening 38 and a high tension wire 39 connected theretoextends to the spark plug 36 as indicated in diagram in Fig. 3.

The fly-wheel member is keyed to the cranked shaft and turns therewith.As the contact breaker is grounded on the casing and the casing ismounted on the engine shaft, these parts including the spark plug formthe return circuit connection for the high tension circuit.

The pole shoes of the permanent magnets are so spaced with relation tothe armature pole pieces as to just clear the same in revolvingtherearound.

By turning the fixed armature plate by means of the handle the spark maybe advanced or retarded with relation to the en- From the foregoingdescription it will be,

seen that the magneto may be substituted for the fiy-wheel of an engineand perform the function thereof as well as providing the ignitionsystem for the engine. The magneto may also be used with the fly-wheelif desired;

The magneto is very compact in size and eliminates the use of thefly-wheel of the engine and is particularly adapted for use inconnection with detachable row boat motors.

What I claim as my invention is:

1. A magneto comprising a member, a non -rotatable armature mountedthereon and provided with primary and secondary coils, (permanentmagnets revoluble therearoun' a circuit interrupter included in theprimary circuit, for interrupting the current in the primary, and meansfor advancing or retarding the spark, comprising a split sleeve forminga part of said member and adjustably mounted upon the engine frame.

2. A magneto, comprising a member, a non-rotatable armature mountedthereon and having poles projecting therefrom, primary and secondarycircuit coils surrounding said poles, a circuit interrupter included inthe primary coil circuit, for interrupting themounted upon the engineframe, a non-rota table armature mounted thereon and provided withprimary and secondary coils, a member carrying permanentmagnets mounteduponthe engine shaft and revoluble therewith, a switch included in theprimary cir- In testimony whereof, I aflix my signa cuit, and operableby said revoluble member, ture, in presence of two witnesses. tointerrupt the primary circuit, and a man- PETER HAMM. ually operableswitch mounted on said fixed Witnesses:

5 member, for continuously interrupting the C. H. KEENEY,

primary circuit. GERTRUDE SGHOLZ.

